package com.xiaoke.java1;

import java.io.FileNotFoundException;

/**
 * @author yd
 * @version 1.0
 * @date 2022/1/5 22:47
 */
public class CustomClassLoader extends ClassLoader {

    @Override
    protected Class<?> findClass(String name) throws ClassNotFoundException {


        try {
            byte[] result = getClassFromCustomPath(name);
            if(result == null){
                throw  new FileNotFoundException();
            }else {
                return defineClass(name, result, 0, result.length);
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }

        throw new ClassNotFoundException(name);

    }

    private byte[] getClassFromCustomPath(String name) {
        //从自定义路径中加载指定类：细节略
        //如果指定路径的字节码文件进行了加密，则需要在此方法中进行解密操作
        return  null;
    }

    public static void main(String[] args) {

        CustomClassLoader customClassLoader = new CustomClassLoader();
        try {
            Class<?> clazz = Class.forName("One", true, customClassLoader);
            Object o = clazz.newInstance();
            System.out.println(o.getClass().getClassLoader());
        } catch (Exception e) {
            e.printStackTrace();
        }

    }


}
